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use crate::{self as libc, errno, string};
use core::fmt;
use core::ops::{Deref, DerefMut};
pub struct Error {
pub errno: errno::Errno,
}
impl From<Error> for fmt::Error {
fn from(_err: Error) -> fmt::Error {
fmt::Error
}
}
pub type Result<T> = core::result::Result<T, Error>;
#[inline]
fn check_io(ok: bool) -> Result<()> {
if ok {
Ok(())
} else {
Err(Error {
errno: errno::errno(),
})
}
}
pub struct BasicOStream(*mut libc::FILE);
unsafe impl Sync for BasicOStream {}
unsafe impl Send for BasicOStream {}
pub type Stdout = BasicOStream;
pub type Stderr = BasicOStream;
#[inline]
pub fn stdout() -> Stdout {
BasicOStream(unsafe { libc::stdout })
}
#[inline]
pub fn stderr() -> Stderr {
BasicOStream(unsafe { libc::stderr })
}
impl BasicOStream {
#[inline]
pub fn flush(&mut self) -> Result<()> {
check_io(unsafe { libc::fflush(self.0) } == 0)
}
#[inline]
pub fn write(&mut self, b: &[u8]) -> Result<()> {
check_io(unsafe { libc::fwrite(b.as_ptr().cast(), 1, b.len(), self.0) } == b.len())
}
#[inline]
pub fn puts(&mut self, s: &string::CStr) -> Result<()> {
check_io(unsafe { libc::fputs(s.as_ptr(), self.0) } != libc::EOF)
}
}
impl fmt::Write for BasicOStream {
#[inline]
fn write_str(&mut self, s: &str) -> fmt::Result {
self.write(s.as_bytes())?;
Ok(())
}
}
pub struct OStream(BasicOStream);
impl OStream {
#[inline]
pub unsafe fn from_raw(file: *mut libc::FILE) -> OStream {
OStream(BasicOStream(file))
}
}
impl Drop for OStream {
#[inline]
fn drop(&mut self) {
unsafe {
libc::fclose((self.0).0);
}
}
}
impl Deref for OStream {
type Target = BasicOStream;
#[inline]
fn deref(&self) -> &BasicOStream {
&self.0
}
}
impl DerefMut for OStream {
#[inline]
fn deref_mut(&mut self) -> &mut BasicOStream {
&mut self.0
}
}
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